Warp tension equalizer



March 20, 1934. T. c. DEMERs WARP TENSION EQUALIZER 2 Sheets-Sheet 1 Filed July 2, 1932 March 20, 1934. T. c. DEMERS WARP TENSION EQUALIZ'ER Filed July 2. 1932 2 Sheets-Sheet 2 Patented Mar. 20, 1934 ETE!) ST r otros This invention relates to the let-olii mechanism for looms and has for its object the simplification and increase in eiiiciency of devices for maintaining the proper tension upon the warp so that the let-of will be even and free from all jerking action, thereby avoiding the presence of thick and thin spots in the iinished product. The invention is illustrated in the accompanying drawings and will be hereinafter fully described, the novel features being particularly dened in the appended claims. l

In the drawings, Fig. 1 is a side elevation, partly broken away and in section, o1 a warp-tension equalizing mechanism embodying the present in vention,

Fig. 2 is an enlarged longitudinal section through the tension-equalizing devices,

Fig. 3 is a detail section on the line 3-3 of Fig. 2,

Fig. l is a detail section on the line 4-4 of Fig. 2,

Fig. 5 is a detail section on the line 5 5 of Fig. 2,

Figs. 6 and 7 are detail perspective views of the ends of the back lash equalizer rod and of the pick measure.

The reference numeral 1 indicates a portion of a loom frame which may be of any known or approved construction, the Yreference numeral 2 indicates'a bracket secured to and extending from the loom frame, and the numeral 3 indicates the warp head. The warp head is secured upon the trunnion 4 or the warp beain and is duplicated at the two sides of the loom, the tension-equalizing devices associated with the head being likewise duplicated, as is the usual practice. Resting upon the warp head is a brake or friction shoe 5 and attached to the front end of this shoe is a friction or brake band 6 which passes under the warp 40 head and is equipped at its rear end with a pivotally attached tension bolt 7 passing through a notched lug 8 at the end of the shoe and having a wing nut 9 mounted upon its upper end. A tension spring 10 is disposed about the tension bolt or screw, between the lug 8 and the wing nut, so that the tension may be adjusted to create the proper rictional engagement between the shoe and the band with the warp head. Rising from the shoe 5 is a split lug 11 which has substantially 50 cylindrical openings formed therethrough in the upper and lower portions of the vertical split 12, as indicated at 13 and 14, and between the said cylindrical openings is a transverse opening which is threaded at one side of the split to receive a securing screw or bolt 15 whereby the sides of the split may be caused to approach and rmly clamp and hold the back lash rod and the picker stop measure, as will presently appear.

The bracket 2 carries a traine member 16 to the sideof which secured a casting or abutment block 17 and it should be understood that while I have shown and mentioned the bracket 2 rising from a portion of the loom frame, the bracket is not an essential element and in many instances the casting i7 may be secured directly to a part of the loom. The casting 17 is disposed in the vertical plane of the warp head and projects frorn the part to which it is attached rearwardly toward the lug l1 which rises from the shoe 5, the rear end of the casting or block being formed with an outwardly extending web 18 and having upper and lower bracing webs 19 extending from its side to said web 18 so that a very Vstrong device is provided. In the web Y18 is formed a slot 2o from the upper end of which extends a branch 21 opening through the edge of the web and at the lower end or" which is an inwardly extending notch 22. Fitted through the lower longitudinal opening 14 in the lug 11 is the baci; lash equalizer rod 23 which has its forward end adapted to pass through the notch 21 and seat at the lower end of the slot 20, as will be understood upon reference to Fig.

3, the back endo the rod being properly shaped, as indicated at 2li, to facilitate the engagement therewith of any convenient turning tool. The front end of the rod 23 is threaded, as shown at 25, and mounted upon saidthreaded front end are lock nuts 26 which maintain the proper po sition of the rod relative to they casting 17, a washer 27 being interposed between ther nuts and the web 18, as clearly shown in Figs. 1 and 2. Between the web 18 and the lug 11 a spacing sleeve 23 and washers 29 are mounted upon the rod 23 and an equalizer spring or cushion 30 is disposed about the rod between said washers. The spring is shown as a coiled spring, but it may be a block of rubber or leather ror any other material which will serve satisfactorily as a shock absorber.

The upper opening 13 through the lug 11 receives the rear threaded end 31 of a pick stop measure 32 which may, conveniently, be a bolt having its head 33 presented toward the web 18 of the casting 17, which web serves as an abutment against which the head of the pick stop may impinge in the operation of the device rso as to limit the movement of the shoe and the cooperating parts to the distance traveled by the warp during one pick o1 the loom. The rear end of the pick measure stop bolt is longitudinally split, as shown at 34, whereby it may be Very easily tted in and adjusted in the lug l1 and a lock nut 35 is mounted upon the bolt and turned home against the front side of the lug l1 to maintain the adjustment.

In operation, the wing nut 9 is set to create the proper frictional engagement between the warp head and the shoe 5 and band 6 in the usual manner and the device will follow the movement oi the warp head as the warp is drawn oil the warp beam to pass to the harness. The picker stop '32 is adjusted so that the head 33 will be spaced from the abutment i8 the exact distance the warp is to travel during one pick of the loom, and this distance may be a thousandth of an inch ora greater distance according to the material which is to be woven and the style of the weave and various conditions known to weavers and loom operators. The lock nut 35 working on Vthe longitudinally split threaded portion of the pick stop and bearing against the lug rising from the shoe will positively retain the pick stop in the set position so that the measure will be maintained through the entire operation. The back lash rod 23 will, of course, move forwardly with the shoe and the warp head and will slide readily through the slot 20 in the supporting bracket or casting the spring 3i) being gradually conipressed as the movement proceeds and the movehead of the pick stop impinges against the web 18 of the casting. The movement of the warp beam and the head, however, will not be entirely arrested but will be retarded owing to the irictional engagement between the tension devices and the head so that the warp will be let ofi evenly and gradually and without any jerks. The tensien of the spring 30 will act upon the lug li, of course, and will return the parts to their initial position for a repetition of the operation, as soon as the strain upon the warp beam is released, thereby overcoming all tendency of the warp to feed irregularly and eliminating the thick or-thin places in the cloth. When the next pull upon the warp occurs, the operation will be repeated and the warp will be kept properly taut during the entire operation of the loom. The piel; stop measure may be set so to abut the web i8 and thereby be restrained from all forward movement, which may he desirable at times if light material is being woven, and removal of the pick stop measure will not interfere with the proper action ci the equalizing elements.

Having thus described the invention, I claim: l.. 'In apparatus for the purpose set forth, the combination with a warp vice engaged t u the w rp an equalizer device carried by the tenso-n device `and extend-` ing forwardly therefrom, an abutment member constructed to receive removably the frontend of the eoualizing device, means forcushioninfr the forward movement of the equalizer device of a tension delimit movement of the tension and initiating a reverse movement thereof', a picker stop carried by the tension device adjacent the equalizer and adapted to inipinge against the abutment, said abutment cooperating with said picker stop for limiting the forward movement of the head during a picking operation, and means carried by the tension device between the equalizing device and the picker stop and adapted for clamping said equalising device and said picker stop in `a locked position on said tension device.

'2. In apparatus for the purpose set forth, the

-combination of a, warp head, a tension device engaged around the warp head and provided with an upstanding vertically split lug, an equalizer rod having oneend engaged through the split lug and projecting forwardly therefrom, an abutment member supporting the front end of the equalizer rod, a cushion disposed between said abutment member and the lug to gradually check the forward movement oi the equalizer rod `and initiate reverse movement thereof, a picker vstop engaged at its rear end in the split lug and projecting .forwardly therefrom to inipinge against the abutment member, means whereby the picker stop may be set at a predetermined distance froxn vthe abutment member, and rmeans whereby the lug may be caused to clamp .the equalizer rod and the picler stop.

3. In apparatus for the purpose set forth, the combination with warp head, of a tension device engaged around the warp head, a iug rising from the tension device and constructed with a vertical long dinaliy extending split, an abutment member located in front of the lug, an equalizer rod having its rear end engaged through the lower portion of the split in the lug 'and its front end supported and guided by the abutment member, a picker stop having its rear end ysecured in the upper portion of the split in the lug and its Vfront end disposed in position to impinge against the abutment member, the rear end of the picker stop being externally threaded and longitudinally split, a lock nut engaged upon the threaded split portion of the picker stop to'bear against the side of .the lug, and a clamping bolt inserted transversely ,through the lug'between Vthe equalizer rod and the picker stop.

ll. In apparatus for the purpose set forth, the combination with a warp vhead and a tension device engaged therewith, said tension device having a peripheral lug, of an equaliser device llengthwise therein at the side or" the equalizer device, and a guiding and abutment member disposed in the path of the picl: stop whereby vto device and support and guide a portion of the equalizer device.

TELESPHORE C. DEMERS. l.. 5.] 

